/Engine/Plugins/Media/MediaIOFramework/Source/MediaIOCore/Public/MediaIOCoreAudioOutput.h
Called when a new buffer has been rendered for a given submix
virtual void OnNewSubmixBuffer ( const [USoundSubmix](API\Runtime\Engine\Sound\USoundSubmix) * OwningSubmix, float * AudioData, int32 NumSamples, int32 NumChannels, const int32 SampleRate, double AudioClock )